2000
Berufungen: Cornell Law School, Pennsylvania Law School, Texas Law School, und NYU School of Law

Seit 2000
Verschiedene Gastprofessuren, Lectureships u.a.:

Yale Law School, Florence Rogatz Visiting Professor of Law (Herbst 2014)
European University Institute (Herbst 2012)
Harvard Law School, Visiting Professor of Law and John Harvey Gregory Lecturer on World Organization (Herbst 2009)
National University of Singapore (Sommer 2007/2008)
Bucerius Law School, Commerzbank Visiting Professor of Law (Herbst 2003)
University of Navarra (2006/2007/2008)
Central European University (2007)
Fletcher School of Law and Diplomacy - Tufts University (1999/2000)

Kumm, Mattias (2016): "Sovereignty and the Right to Be Left Alone. Subsidiarity, Justice-Sensitive Externalities, and the Proper Domain of the Consent Requirement in International Law". In: Law and Contemporary Problems, Vol. 79, No. 2, S. 239-258.

Kumm, Mattias (2014): "Rebel Without a Good Cause. Karlsruhe's Misguided Attempt to Draw the CJEU into a Game of 'Chicken' and What the CJEU Might Do about It". In: German Law Journal, Vol. 15, No. 2, Special Issue "The OMT Decision of the German Federal Constitutional Court", S. 203-215.

Kumm, Mattias (2012): "The Idea of Thick Constitutional Patriotism and Its Implications for the Role and Structure of European Legal History". In: Helle Porsdam/Thomas Elholm (Eds.): Dialogues on Justice. European Perspectives on Law and Humanities. Law & Literature, Vol. 3. Berlin/Boston, MA: Walter de Gruyter, S. 108-137.

Kumm, Mattias (2011): "European Legality and Jurisdictional Justification. How the ECJ Should Determine the Legality of Legislation under Art. 114 TFEU". In: Flavia Carbonell/Agustín José Menéndez/John Erik Fossum (Eds.): Hope, Reluctance or Fear?. The Democratic Consequences of the Case Law of the European Court of Justice. Arena Report. Oslo: Arena Centre for European Studies at the University of Oslo, S. 115-165.

Kumm, Mattias (2011): "How Does European Union Law Fit into the World of Public Law? Costa, Kadi, and Three Models of Public Law". In: Jürgen Neyer/Antje Wiener (Eds.): Political Theory of the European Union. Oxford/New York, NY: Oxford University Press, S. 111-138.

Kumm, Mattias (2010): "Internationale Handelsgesellschaft, Nold and the New Human Rights Paradigm". In: Miguel Poiares Maduro/Loïc Azoulai (Eds.): The Past and Future of EU Law. The Classics of EU Law Revisited on the 50th Anniversary of the Rome Trea